package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import javax.annotation.Resource;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author 860620068
 * @Date 2021/6/10 :11:28
 * @desceiption:
 */
@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Resource
    private RestHighLevelClient esRestClient;

    @Resource
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam param) {
        //1.动态构建出查询需要的DSL语句
        SearchResult result = null;
        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try{
            //2.执行检索请求
            SearchResponse response = esRestClient.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            //3. 分析相应数据，封装成我们需要的格式
            result = buildSearchRequest(response,param);
        }catch (IOException e){
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建结果数据
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），完成排序，分页，高亮，聚合分析功能
     * @param response
     * @param param
     * @return
     */
    private SearchResult buildSearchRequest(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        //遍历所有商品信息
        if(hits.getHits()!=null && hits.getHits().length>0){
            for (SearchHit hit: hits.getHits()){
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString,SkuEsModel.class);

                //判断是否按关键字检索，若是就显示高亮，否则不显示
                if(!StringUtils.isEmpty(param.getKeyword())){
                    //拿到高亮信息显示标题
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String skuTitleValue = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(skuTitleValue);
                }
                esModels.add(esModel);
            }
        }
        result.setProduct(esModels);

        //2.当前商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        //获取属性信息的聚合
        ParsedNested attrsAgg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attrIdAgg = attrsAgg.getAggregations().get("attr_id_agg");
        for(Terms.Bucket bucket: attrIdAgg.getBuckets()){
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            //1.得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);

            //2.得到属性的名字
            ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);

            //3.得到属性的所有值
            ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValues = attrValueAgg.getBuckets().stream()
                    .map(item->{
                       return  ((Terms.Bucket) item).getKeyAsString();
                    }).collect(Collectors.toList());
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3.当前商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        //获取到品牌的聚合
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for(Terms.Bucket bucket:brandAgg.getBuckets()){
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            //1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            //2.得到品牌的名字
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);

            //3.得到品牌的图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);

            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        //4.当前商品涉及到的所有分类信息
        //获取到分类的聚合
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
        for(Terms.Bucket bucket: catalogAgg.getBuckets()){
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
        //==========以上可以从聚合信息中获取==============
        //5.分页信息-页码
        result.setPageNum(param.getPageNum());
        //5.1 分页信息。总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        //5.2 分页信息-总页码-计算
        int totalPages = (int) total%EsConstant.PRODUCT_PAGESIZE == 0?
                (int)total/EsConstant.PRODUCT_PAGESIZE:((int)total/EsConstant.PRODUCT_PAGESIZE+1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for(int i=1;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        //6.构建面包屑导航
        if(param.getAttrs()!=null && param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr->{
                //1.分析每一个attrs传过来的参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                if(r.getCode()==0){
                    AttrResponseVo data = r.getData("attr",new TypeReference<AttrResponseVo>(){

                    });
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }

                //2.取消了这个面包屑以后，我们要跳转到哪个地方，将请求的地址url里面的当前置空
                //拿到所有的查询条件，去掉当前
                String encode = null;
                try{
                    encode = URLEncoder.encode(attr,"UTF-8");
                    encode.replace("+","%20");//浏览器对空格的编码和java不一样，差异化处理
                }catch (UnsupportedEncodingException e){
                    e.printStackTrace();
                }
                String replace = param.get_queryString().replace("&attrs="+attr,"");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     *
     * @param param
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1.构建bool-query
        BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();

        //1.1 bool-must
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2 bool-fiter
        //1.2.1 catelogId
        if (null != param.getCatalog3Id()) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2.2 brandId
        if (null != param.getBrandId() && param.getBrandId().size() > 0) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("brandId", param.getBrandId()));
        }

        //1.2.3 attrs
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            param.getAttrs().forEach(item -> {
                //attrs=1_5寸：8寸&2_16G:8G
                BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

                //attrs=1_5寸：8寸
                String[] s = item.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");//这个属性检索用的值
                boolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                boolQuery.must(QueryBuilders.termQuery("attrs.attrValue", attrValues));

                NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", boolQuery, ScoreMode.None);

                boolQueryBuilder.filter(nestedQueryBuilder);
            });
        }
        //1.2.4 hasStock
        if (null != param.getHasStock()) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2.5 skuPrice
        if (!StringUtils.isEmpty(param.getSkuPrices())) {
            //skuPrice形式为：1_500或_500或500_
            RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("skuPrice");
            String[] price = param.getSkuPrices().split("_");
            if (price.length == 2) {
                rangeQueryBuilder.gte(price[0]).lte(price[1]);
            } else if (price.length == 1) {
                if (param.getSkuPrices().startsWith("_")) {
                    rangeQueryBuilder.lte(price[1]);
                }
                if (param.getSkuPrices().endsWith("_")) {
                    rangeQueryBuilder.gte(price[0]);
                }
            }
            //封装所有的查询条件
            boolQueryBuilder.filter(rangeQueryBuilder);
        }
        searchSourceBuilder.query(boolQueryBuilder);
        /**
         * 排序 分页 高亮
         */
        //排序
        //形式为 sort=hotScore_asc/desc
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] sortFileds = sort.split("_");

            SortOrder sortOrder = "asc".equalsIgnoreCase(sortFileds[1]) ? SortOrder.ASC : SortOrder.DESC;
            searchSourceBuilder.sort(sortFileds[0], sortOrder);
        }

        //分页
        searchSourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");

            searchSourceBuilder.highlighter(highlightBuilder);
        }
        /**
         * 聚合分析
         */
        //1.按照品牌进行聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);

        //1.1 品牌的子聚合-品牌名聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        //1.2 品牌的子聚合-品牌图片聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        searchSourceBuilder.aggregation(brand_agg);

        //2.按照分类信息进行聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(20);

        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));

        searchSourceBuilder.aggregation(catalog_agg);

        //2.按照属性信息进行聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg","attrs");
        //2.1 按照属性ID进行聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_agg.subAggregation(attr_id_agg);
        //2.1.1 在每个属性ID下，按照属性名进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        searchSourceBuilder.aggregation(attr_agg);

        log.debug("构建的DSL语句{}",searchSourceBuilder.toString());

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX},searchSourceBuilder);
        return searchRequest;

    }


}







